Window-blind fitting



,507324 C. NEVATT WINDOW BLIND FITTING Filed Nov. 27, 1922 a /7\. 5 if\T /0 3 11.i 4 f i Patented Sept. Z, 1924.

CHARLES. NEVA-TT, OF GLASGOW, SCOTLAND.

lNINDO#BLIND FITTNG.

Application led November 27, 1922. 'Serial No.' 603,410.`

To @ZZ whom t may concern:

Be it known that l, CHARLES Nnvnfrr, a Subj ect of the Kin g of theUnited Kingdom of Great Britain and ireland, residing at Pollokshields,Glasgow, Scotlanchhave invented a certain new and useful Improvement in1Window-Blind Fittings, of which the following is a specification.

This invention relates to window-blind fittings of the type including aratchet wheel held to the blind roller by friction for permitting theblind to be lowered whilc the ratchet wheel is locked.

The main object of the invention is to provide an improved fitting ofthis type of simple and inexpensive construction.

A further object is to provide a fitting of this type which permits ofspeedy and simple insertion or removal of the roller.

The invention is illustrated in the accompanying drawing in which Fig. 1is a fragmentary front elevation, and Fig. 2 an end elevation.

The improved window blind fitting shown comprises a blind roller 1having journals 2. 3 at its ends. The journal 2 is adapted for insertionin a bearing aperture 4 and the journal 3 is receivable in a hook member5 carried by a bracket 6. Pivoted -to the bracket 6 is a detent 7 orescapement` device having a small rangel of movement limited by stops 8,8-, the stop 8"L ensuring that the detent will not fall over backwardlyand the stop 8 ensuring that the detent will not fall into the spaceoccupied by the ratchet wheel. A ratchet wheel 9 is held between ashoulder 10 at the end of the cord drum 14 of the journal 3 and collar11 secured thereto and is pressed against the shoulder 10 by springmeans such as the washer 12 bearing against the collar 11. The washerhas radiating arms which enter recesses 13 which maybe formed, ifdesired in the adjacent end face of the ratchet wheel 9. 15 denotes thecord aperture of the drum 14. The bracket 6 is formed as a channel withspaced side walls accommodating the detent and retaining it in properposition while preventing lateral play. The detent being mounted upon apin 20 which is pivoted in both of the side walls of the bracket 6, doesnot cant when the parts become somewhat worn as does the usual detentwhich is pivoted on only one side, being broad and always held properlyin place between the side walls it will always automatically en- Afromfalling too gage the ratchet tween-the walls. The inner wall is cut awayto small dimensions to provide clearance for the cord drum 14 while theouter wall of the channel is partly cut away to form the hook member 5and provided with perforations horizontally disposed woodwork, one ofthe lugs constituting the stop 81 aforesaid.

The operation of the device is as follows:

The roller is tted in position by inserting the ournal 2 in the bearingaperture 4 and simply placing the' journal. 3 into the gape of the hookmember 5. ln so doing the detent 7 is raised by the sloping parts of theratchet teeth and thereafter automatically falls again into positionunder the action of gravity. Stops 8 prevent the detent 7 far downwardsandA thus jn'eventing easy insertion of the roller. The roller is heldiii-working position simplyby the action of gravity.

Then a downward force orv pull is applied to the lower edge of the blind18 or to lthe end of the cord attached thereto, the blind is unrolledfrom the roller against the friction. induced between the side of theratchet wheel 9, which is held stationary by the detent 7, and theshoulder 10 of the revolving drum 14, the ratchet wheel being pressedagainst said shoulder by the action of the spring washer 12. Theoperation of lowering the blind coils the cord 19 on the drum 14 so thatby exerting a downward torce on that part of the cord depending from thedrum the roller will be rotated in a clockwise direction (Fig. 2) andthe blind raised, the detent 7 then riding over the sloping parts of theratchet-wheel teeth so that the said wheel is free to turn with theroller, the friction between the ratchet wheel and shoulder 10 beingsufficient to carry the wheel round with the roller.

To withdraw the roller from the brackets, its right hand end (Fig. 1) issimply raised and passed over the hook 5 and the journal 2 is withdrawnfrom the bearing ape ture 4.

What I claim is 1. A window blind fitting comprising, in

on the insertion thereof bep combination, a blind roller, a drum-formingjournal and a bearing journal one at each end of the said roller, saidldrum-forming journal being adapted to receive the cord and provided withay shoulder and a collar, a ratchet wheel held between said shoulder andsaid collar, a spring washer holding said wheel in contact with saidshoulder, a bearing having an aperture to receive said bear- "ingjournal, a double walled bracket having its outer wall formed with aforwardly projecting hook to' receive and support said drum-formingjournal and having a detent mounted on a pin pivoted to and between'both of its side walls.

3. A window blind fitting comprising, in combination, a blind roller, adrum-forming journal anda bearing journal one at each en'dvo saidroller, said drum-forming jour nal being adapted to receivethe cord andprovided with ashoulder and a collar, a ratchet wheel held between saidshoulder and said collar and provided with recesses in its `outer face,a spring washer pressing said wheel against said shoulder, said'washerhaving radiating arms entering said recesses, a bearing having anaperture to receive said bearing journaha double walled bracket havingits outer wall formed with a hook to receive and support saiddrumforming journal, a detent mounted on a pin pivoted to and betweenthe side walls of the bracket, an inwardly projecting flange on the saidouter wall to limit movement of the detent in an upward direction, and arearward extension of the detent adapted to contact with the web of thebracket between its walls to limit movementof the detent in. a downwarddirection.v

4. An improved window blind fitting comprising, in combination, a blindroller,

a drinn-forming ijournal and va bearing journal disposed onevat eachendy of said roller, said drum-forming journal adapted to receive thecord and provided with a shoulder anda collar, a bearing having anaperture to receive said bearing journal, a

double-walled bracketv with its outer wall presenting a hookedv memberadapted to receive saidl drum-forming journal, a detent pivoted to saidbracket between its 'walls and held against lateral play thereby, meanson the detent for limiting itsl downward pivotal movement, the flange onthe outer wall of the bracket serving to limit its move-4 ment in theupward direction, a ratchet wheel held between said shoulder and said.collar, and a spring washer pressing said wheel against said shoulder.

In testimony whereof I have signedvmy name to this specification in thepresence of two subscribing witnesses.

f cHAs. NEvA'rT.

Witnesses:

ISABELL ROLLS, ANNE L. WATT.

